Furnace



sheets-$119999.

(No M6991.)

190.486,999. Patented Nov. 29.1892.

-mul hm.

UME STATES PATENT OFFICE.

HORACE K. TALLMAGE, OF BUFFALO, NEV YORK.

FURNACE.

SPECIFICATION forming part of Letters Patent N o. 486,990, dated November 29, 1892. Application tiled duly 23, 1891. Serial No. 400.406. (No model.)

To all whom t may concern:

Be it known that I, HORACE K. TALLMAGE,

a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Furnaces, of which the following is a specification.

This invention relates to hot-air furnaces in which the cold air is heated by passing through heating pipes or flues arranged within the combustion-chamber.

One of the objects of my invention is to increase the radiating area of the furnace without increasing its size.

The invention has the further objects to provide the smoke-pipe with a simple draftcheck and to provide means whereby the heat is more effectively employed when natural gas is used as fuel.

In the accompanyingdrawings, consisting of two sheets, Figure l is a sectional elevation of my improved furnace. Fig. 2 is a horizontal section thereof in line c 0c, Fig. l.

Fig. 3 is a sectional elevation of the furnace at right angles to Fig. l. Fig. 4 is a top plan view of the furnace. Fig. 5 is a fragmentary vertical section, on an enlarged scale, of one of the pipe-joints.

Like letters of reference refer to like parts in the several figures.

A represents the inclosing casing or brickwork of the furnace; B, the ash-pit; C, the dre-pot resting upon the ash-pit; C', the grate; D, the combustion or heating chamber surmounting the tire-pot, and E the fire-door. The combustion-chamber is composed of a cylindrical shell D', preferably of wroughtiron, a dome D2, and a bottom plate or ring D3, which surrounds the top of the lire-pot. The dome and bottom plate are preferably constructed of cast-iron, and the dome is riveted to the upper end of the shell D', while the latter is secured to the bottom plate by bolts d, passingthrough perforated ears formed on the adjacent portions of the shell and bottom plate, as shown.

F represents upwardly-converging heating pipes or lines arranged Within the combustion-chamber and extending from the bottom ring D3 to the top of the dome D2. The bot` tom ring is provided within the combustionchamber with raised hollow abutments or sup- `of the lilies are then port-s G, having inclined or beveled upper sides g, through which the lower open ends of the converging flues pass, the inclined upper sides of the abutments beingformedwith openings for the passage of the dues. The central portion d of the dome D2isdepressed in the shape of an inverted cone and the upper ends of the converging flues pass through openings in said conical central portion. The upper ends of the converging dues are flanged or upset againstthe upper side of the conical central portion of the dome and the lower ends of the flues are similarly upset against the under sides of the inclined abutments G. Each ilue is provided with a collar h, which bears against the. under side of the conical central portion of the dome, so as to form with the'upset flanges of the flues a tight joint. In putting the converging lines in place the collars are first secured to the upper portions of the fines, and the lower ends of the tlues before being upset are then passed through the openings in the inclined abutments G, the fines being placed in the combustion-chamber before the dome is secured to the shell. The straight upper ends openings in the conical portion of the dome and upset, whereby the upperends of the flues are tightly secured to the dome. The lower ends of the lines are then upset against the under side of the bottom ring. By connecting the upper and lower ends of the converging flues with beveled or inclined abutments the ends of the yflues may be cut off square instead of obliquely, which wouldbe necessary if the ends of the tubes were secured to horizontal abutments, thereby enabling the tubes to be more reliably fitted and cheapening and simplifying theconstruction of the furnace. i

I are upright heating pipes orflues arr'a ed in the combustion-chamber between th'lcnverging tlues F and secured at their upper ends in openings in the dome and at their lower ends in openings in the bottom ring in a manner similar to the converging lines. The openings for 'the lower ends of the upright iiues are formed in the horizontal portions of thebottom ring between the inclined is provided on its horizontal lugs or abutments G. The dome inner side with projecting passed through the IOO abutments J, having openings for the passage of the upper ends of the ilues and against the under sides of which the collars at the upper portions of the iiues bear. These horizontal abutments are preferably formed by casting depressions in the outer side of the dome, so as to form the projecting lugs on the inner side thereof, as shown in Fig. 1.

7i; is a ring or raised annular wall arranged in the bottom of the combustion-chamber on the inner sides of the two series of flues and forming with the adjacent wall Cf the combustion-chamber a circular packing-box K. This box is iilled with sand or other similar material, which envelops the lower portions of the flues, thereby forming a tight joint, protecting the lower joints of the lues from direct contact with the heat and rendering the joints more durable.

By converging one series of pipes or flues upwardly a considerable portion of their area is brought directly over the lire-pot, where the heat is most intense, and by alternating such converging pipes with upright pipes the space between the converging pipes is also utilized, thus increasing the aggregate flue area without enlarging the furnace.

The converging iiues are preferably covered on their inner sides with metallic shields Z, which extend from the lower ends of the ilues nearly to their upper ends, as shown in Fig. 1. rFliese shields protect the inner p01?- tions ofthe flues from direct contact with the intense heat rising from the fire-pot.

M is an ascending smoke pipe or flue arranged within the combustion-chamber and terminating in the upper portion thereof, and N is the chimney-Hue with which the smokepipe is connected. The smokefpipe is provided at its lower end with a pocket or re,- ceptacle O, which extends below the point at which the chimney-flue joins the smoke-pipe. To the lower end of this pocket is connected a cleaning-pipe P, extending through the casing of the furnace and closed at its outer end by a cover. 'Ihis cover also serves as a check for regulating the draft, and consists of a sleeve q, closed at its outer end by a cap q and provided with longitudinal slots or apertures q2. Upon partly withdrawing the check or cover to expose the slots a draft is created through the cleaner-pipe P, pocket O, and chimney-liuc N, whereby the force of the draft is diminished. By withdrawing the check to a greater or less extent the draft may be regulated as desired. The soot which is deposited in the smoke-liuc settles into the pocket O and is cleaned out from time to time by removing the cover and introducing a shovel or other implement through the cleaner-pipe. j

In burning natural gas in the furnace the flame tends to curl inwardly Vaway from the walls of the fire pot and the combustionchamber, and in order to confine the flame against said Walls a deector R is arranged in the central portion of the fire-pot, which lls the greater portion of the Ispace of the fire-pot and compels the ame to hug the walls of the fire-pot. This deector preferably consists of a hollow metallic chamber or box supported within the tire-pot by brackets fr and having its bottom and sides separated from the surrounding fire pot by a passage r', through which the ame and gases ascend intothecombustion-chamberabovel Bythus deiiecting the flame against the Walls of the fire-pot, instead of allowing it to occupy the center thereof, the flame, as it emerges into the combustion-cham ber, is directed outwardly against the walls of the latter, thereby more highly heating said walls and more effectively utilizing the heat.

The deflector is preferably made removable, so that it can be conveniently taken out Y of the furnace when it is desired to burn coal.

In the drawings the deflector is represented as terminating at the top of the fire-pot; but, if desired, it may be extended upwardly into the combustion-chamber.

I claim as my invention-M 1. In a furnace, the combination, with the combustion-chamber having a horizontal bottom ring or plate provided with inclined abutments and a dome or top provided with an inverted conical central portion and horizontal lugs or abutments arranged between said conical central portion and the wall of the dome, of upwardly-converging flues arranged in the combustion-chamber and secured at their upper ends to the conical central port-ion of said dome and at their lower ends to the inclined abutments of the bottom ring and vertical ues arranged in the combustion chamber between the converging fines and secured at their upper ends to the horizontal lugs of the dome and at their lower ends to the horizontal surfaces of the bottom ring, substantially asset forth.

2. In a furnace, the combination, with the l combustion-chamber having a dome-shaped top formed with an inverted conical central portion and depressions forming interior horizontal surfaces and a horizontal bottom ring having raised inclined abutments or surfaces, of inclined flues secured at their respective ends to the conical portion of the dome and the raised inclined surfaces of the bottom ring and alternating vertical flues secured at their respective ends to the horizontal surfaces of the dome and the bottom ring, substantially as set forth.

Witness my hand this 14th day of July, 1891.

HORACE K. TALLMAGE.

Witnesses:

FRED C. GEYER, JNO. J. BoNNEn. 

